High-power radio apparatus.



PL]. HACKETT.. HiGH POWER RADIO A ATUS.

Iwucmou FILED 0E 1915.

1,199,176. Patented Sept. 26,1916.

@I Q IQF IQ Q WITNESS fi INVENTOR Qi-m 3 1 A TTORNE Y wm? A 1,199,1Fii.

To ((ZZ whom it may concern unrrnn snares re PAUL J. HACKETT, OF SEATTLE VIASHIINGTON, QSSIGNOR OF ONE-MILE TO UNIVER- SAL HIGH POWER TELEPHCNE COMPANY, 0? KING CQUNTY, WASHINGTON.

HIGH-POWER RADIO APPARATUS.

Application filed December 27, 1915.

Be it known that 1, PAUL J. Hacnnrr, a citizen of the United States, and a resident of Seattle, in the county ofKing and State of Washington, have invented certain new and useful Improvements in High- Power Radio Apparatus, of which the following is a full, true, and exact specification.

My invention relates to high power wireless apparatus and has for its principal object to provide an improved arrangement of transmitting units, whereby a more nearly uniform division of the actuat ng current is secured between the various units and the rapid burning out of single units which may drop below the resistance of the other un ts is prevented.

In my previous application No. 28,783, I brought out the idea of a receiver actuating a group oftransmitters similar to the transmitter referred to in my application No.

into groups and the assembly of the various groups which will be dealt with in this ap-f plication. I have found by actual tests that when a group of units are all arranged in parallel, the weakening of the resistance of any one unit throws a disproportionate load upon it of suliicient strength to burn it out. Further, the inability of the various units to maintain a constant and equal resistance renders them very susceptible to being burned out one by one until the group is rendered useless. The arrangement of units into series connected groups each of which are then brought into parallel as a single unit has been found to averz-i-ge the resistance of the various units in the group and thus give resistance between the parallels which, being the average of several units, will remain more nearly constant.

Other objects will appear as my invention is more fully explained in the following specification, illustrated in the accompanying drawing and pointed out in the appended claims.

In the drawing, the figure represents a wiring diagram and set-up of a number of Specification of Letters Fatent.

Patented Sept. 26, 1916.

Serial 2E0. 68,724.

mg, numeral A. indicates a single unit which i phragms 2 are-connected in series in each transmitter. Each of the units A which are components of a single group B have their diaphragms 2 connected in series with respect to each other and the group is in turn connected. in parallel to main wires 8 and 4:. The groups B here shown may contain more or even less units if desired, but four has proven a good arrangement. The groups B have their receivers 1 all connected from main lines 5 and 6 which carry current from a transmitter (not shown) to the various receivers 1. The receivers are cross connected that is, one from each group B is connected to leads 7 and 8 which connectinto 5 and 6 respectively. I prefer to group four groups B into a largevcombination group which is served by leads 7 and 8 and to connect as many combination groups together as necessary on lines 5 and 6 and 3 and 4, to give the desired strength of sound wave.

While I have shown a particular form of embodiment of my invention, I am aware that many minor changes therein will readily suggest themselves to others skilled in the art without departing from the spiritand scope of the invention, and I therefore desire to avoid being limited to the. exact form shown and described except as pointed out in the appended claims.

Having described my invention, what I claim as new and desire to protect by Letters Patent, is o 1. In an apparatus of the class described, the combination of a group of multi-diaphragm transmitter units whose various diaof the said transmitter units, the said receivers bein actuated b a sin 'le' transmitter.

2. In an apparatus of the class described, the combination of a parallel connected group of multi-diaphragm transmitter units Whose various diaphragms are connected in series with each other and with the various units in each group, whereby the resistance of the group of units is more nearly'uniform than the resistance of the several units indephragm transmitters arranged in series connected groups of uniform size which are connected 1n parallelto a main. transmitting llne, whereby greater unlformity of resistnected groups of uniform size which are than with all of the units connected in par- 20 allel with the said main line.

4:. In an apparatus of the class described, the combination of high power multi-diaphragm transmitters arranged in series conconnected in parallel to a main transmitting line whereby greater uniformity of resistance in the various groups is maintained than with all of the units connectedin par-. allel with the said main line, and parallel connected receivers Which are cross connected with respect to the said groups and one of which actuates the diaphragms of each unit, the said receivers being actuated by a single transmitter.

PAUL J. HACKETE 

